Door-check.



I E. H. MACKINLAY.

DOOR CHECK.

APPLICATION FILED APR. I4, 1916.

Patented Mar. 6

WW Y

la Zz 21H/1a.) Je Q door, when the door is the line 1f-4 of FDoon-ormai;l y

Application filed April 14., 1916. Serial No. 91,200.

To all 'whom z't may concern.'

Be it known that I, EBEN H. MACKINLAY, a subject of the King of England,residing at Calgary, in the Province of Alberta, Do minion of Canada,have invented certain new and useful Improvements in Door- Checks; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention', such as will enable others skilled in theart to which it appertains to make andI use the. same.

This invention relates to improvements in door checks.

One .object of the invention is to provide a novel and simple device ofthis character wh'ch is adapted to be applied at the hinge site of thedoor to prevent banging of the mounted on spring hlnges.

vAnother object is to provide a device of this character which is simplein construction, and one that can be manufactured and installed at acomparatively low cost.

Other objects and advantages will be apparent from the followingdescription when taken in connection With'the accompanying drawing.

In the drawing:

Figure 1 is an elevation of a portion of a door and frame, broken awayto show my invention in elevation;

Fig. 2 is an enlarged horizontal sectional view on the line 2-2 of Fig.1;

Fig. 3 is an enlarged horizontal section on the same line, but showingthe door in open position,

and the device ready for action when the door is to be moved intoclosedA position; A

Fig. 4 is an enlarged vertical section on 1g. 1. Referring particularlytothe accompanying drawing, l0 represents a portion of the door whichisI mounted on the frame 11 by means of the spring hinges l2 in theadjacent edge of the door, andv at a point approximately intermediatethe hinges there is formed a mortise 13 into which is inserted a tubularmember 14, the bore of which has a spiral groove 15 formed throughout aportion of the length thereof and intermediate the ends. Thus, the outerportion of the bore, as well as, the inner portion is smooth. A flange16 is formed on the outer end of and is countersunk door. opening thetubular member 14 in theedge face of the 'Specification of LettersPatent. y

the door being partially.

v EBEN H. MxoxiNLAr, or CALGARY, ALBERTA, CANADA.

Patented Mar. e, 1917.

Y 17-is formed in and receives therein a plug 1,8, the marginal portionof which projects beyond the end of the tube and is held from voutwardmovement fromv the tube byailange 19 which engages the inner face. ofthe endY of the tube.

recess 20 is formed in theinner end of the plug to receive the head 21of a bolt 22 'which extends longitudinally and centrally through thetube. l Disposed within the center of the tube is a cylindrical member23 having a spiral rib 24 on its peripheral face, which engages iii thespiral groove 15. Encircling the bolt 22, and bearing with its oppositeends respectively against the inner face of the plug and the outer endof the cylindricalvmember 23 is a strong coil spring 25 which acts as abuffer when the plug 18 strikes a wear plate 26 securedI to the adjacentfaces of the upright stile ofthe door frame. 4*In the other end of thecylindrical member is formed a recess 27 which receives the outervend ofa lighter coil spring 428, said spring also encircling the bolt, andbearing end against a transversely extending plate 29. This plate i`sformed with a pair of openings 30 through which extend the guidin pins3l secured lto the inner end of the tuular casing 14. The inner end ofthe bolt is threaded through the said plate at 29.

' Normally, the plug 18 will project beyond the outer end of the tubularmember, and the cylindrical member 23 disposed atthe outer end of thespiral groove 15. When the door is moved into closed position, by theforce of the springs of the hinges, the plug will be forced into the'tubular member so as to compress the spring 25. VThis pressure on thespring will cause the. spring to exert pressure inwardly against ltheson of the enga ement of its'rib with the groove of the tuular member.The spring 25, being stronger than the spring 28, will easily overcomethe spring 28 so as to force the member 23 inwardly. Now, if the door besuddenly closed the spring 25 will be compressed before the block 23 hastime tol rotate and release the tension on said spring 25, said springthus efi'ectually checking the door against any sudden closing. as the'door moves farther from the first checking position into closed'position the block 23 will rotate and the slow movement following thechecking will be taken up Vby the outer end oit the` tube l However,

memb'er 23 thus causing said member to rotate byreathe spring 28. Again,if the kdoor is closed slowly the spring 25 will be compressed verylittle or not at all, the 'block 23 moving in a substantiallysynchronous manner with the plug 18 so that thechecking is accomplishedentirely by the light spring 28. When the door is pulled into openposition, the spring 25 will exert outward pressure against the plug 18so as to cause the same to project beyond the end of the tubular member.The pressure of the spring 25 against the member 23 being thus relieved,the spring 28 can eXpand and Jforce the member 23 to the outermost limitof its movement. The parts are then in position to again act when thedooris permitted to close under the influence of the spring hin es.

What is claime is:

.1. A door check comprising a cylinder disposed within the hinged edgeof a door, a buii'er head projecting from the outer end of the cylinder,the intermediate portion of the interior wall of the cylinder beinggrooved, a spirally ribbed member disposed within the cylinder groove, apin disposed centrally through the ribbed member, a head formed on oneen of the pin and slidable within the buffer head, a spring disposedbetween the ribbed member and the buer head, and a weaker springdisposed between the ribbed member and the other end of the cylinder.

2. A door check comprising a cylinder, a buer head projecting from theouter end of the cylinder, the intermediate portion of the interiorwalls of the cylinder being grooved, a spirally ribbed member disposedwithin the cylinder and engaging in the grooves, a spring disposedbetween the ribbed member andthe buer head, and a weaker spring disposedbetween the ribbed member and the other end of the cylinder.

In testimony whereof l aliix my signature., in the presence of twowitnesses.

- EBEN H. MAGKXNLAY.

Witnesses:

E. M. JACOBS, WILLIAM A. MAcnoNALn.

and engaging in the

